Measurement electrodes, sensors and accesssories


Article number: PL-0071

  • The pH-electrodes have a gel electrolyte and a ceramic diaphragm.
  • 3 m cable, BNC-plug


Article number: PL-0093

  • 3 m cable, BNC-plug

Conductivity-electrode, platinum

Article number: PL-0055

  • 3 m cable, BNC-plug
  • for freshwater and marine water


Article numbers:

  • PL-0094 measurement range aquarium
  • PL-0538 measurement range pond


  • 3 m cable, PS/2-plug


Article number: PL-0368

  • 3 m cable, BNC-plug

Combination sensor humidity/air temperature

Article number: PL-0279

  • 2 m cable, Western-plug

Calibration liquids

Article numbers:

  • PL-0074 pH 4
  • PL-0075 pH 7
  • PL-0076 pH 9
  • PL-0072 220 mV (for Redox)
  • PL-0059 1.41 mS (conductivity fresh water)
  • PL-0073 50 mS (conductivity marine water)

Maintenance set oxygen-sensor

Articlenumber: PL-0555

  • 3 replacment membrane heads
  • 6 ampulls electrolyte
  • sand paper and accessories
  • comes in a handy box

Flow-through measurement cell

Articlenumber: PL-0628

  • 20 mm PVC-fittings
  • The flow-through measurement cell can contain up to 4 sensors with a 12 mm-shaft.
  • An optimized incoming flow supports the self-cleaning of the probes and brings good measurement results, the life span can be increased.
  • It is operated in the return line or in a bypass.



Articlenumber: PL-0850

  • Safe detection of a leakage through 80 spring-loaded contacts on the bottom side of the sensor (picture on the right).
  • A leakage-interface is necessary for operation.
  • incl. cable (1.5 m) for connection with the leakage-interface
  • 2 mounting holes
  • A second port makes it possible to connect several leakage-sensors in a row – multiple measurement loacations increase the security.
  • Only suited for the detection of conductive water (sensor doesn’t work with osmosis water)!
  • Please note: Sensor must not be submerged! Only the 80 contacts on the bottom are allowed to get wet.


Articlenumber: PL-0851

  • is connected at the level-input of the ProfiLux
  • incl. PS/2-cable (2 m) for connecting with ProfiLux
  • 2 ports for leakage-sensors


Splitter for level-sensors PL-LY

Articlenumber: PL-0081

For connecting 2 level- or leakage-sensors with the ProfiLux or with the Expansion Box this splitter is necessary.

Sensor extension cable BNC2

Articlenumber: PL-0053

  • extension cable 2 m, plug-socket
  • for our sensors with BNC-plug

Sensor extension cable VTN

Articlenumber: PL-0339 VTN-2 (2 m) or PL-0358 VTN-5 (5 m)

  • extension cable 2 m or 5 m, socket-plug
  • for our sensors with PS/2-plug

Flow Sensors

GHL offers now a flow sensor which can be connected to the ProfiLux aquarium and pond controller, with this sensor the flow can be measured and observed permanently.

ProfiLux can display the actual measured flow and warn with an acoustic signal, or by sending a SMS or an email, when the flow falls below a preset value. If wished ProfiLux can switch devices on or off in case of a flow alarm. The sensors are connected at the level ports of the ProfiLux.

The flow sensors work extremily reliable and need not much maintenance because they work without dirt-sensitive moving parts like winged wheels.

Two different sensors are available:

  • Flow 100 – 2000 l/h, nominal width DN10, 2x G1/2″ outside thread
  • Flow 300 – 5000 l/h, nominal width DN20, 2x G1″ outside thread

We recommend to use a bypass for higher flows.

Shipment incl. 2m cable Mini-DIN<->M12 to connect the sensor with the ProfiLux. Please note: The sensors are shipped without adapters for hoses or tubes.


  • Our solid and low-maintenance probes are produced in Germany according to high quality standards.
  • Most models have extra long connection cables (3 m).
  • Calibration can be done easily at the push of a button on the ProfiLux controller.
  • All probes are galvanically isolated, therefore they can be used in any combination at the same time without issues.

Please pay attention to the conditions of guarantee and warranty on the bottom of this page.

Warranty and guarantee for sensors

Sensors are items which are wearing out during use. The life span depends mainly on the environment and operation conditions, Because of this, it is not possible to offer a credible guarantee for a minimum life span. For electro-chemical sensors a life span of 6 to 24 months is common, for electrical and mechanical sensors a life span of several years is possible.

Therefore the legal warranty is not valid for wear parts. Nevertheless, since we are convinced of the quality of our sensors we offer following guarantees:

  • Electrical sensors and mechanical sensors (level-sensor, temperature-sensor, conductivity-sensor, humidity-sensor) will be replaced in the first 12 months after purchase. *)
  • Electrochemical sensors (pH-electrode, redox-elektrode, oxygen-sensor) will be replaced in the first 6 months after purchase. *)

*) Appropriate use, correct maintenance and care presumed. No replacements for broken glass or other mechanical damages.